Thread: How long can you sustain riding at 90% HRM?
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Old 04-12-07 | 01:53 AM
  #17  
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Mr.Mavic
Umm...
 
Joined: Jan 2007
Posts: 313
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From: Naperville/Macomb IL

Bikes: Waterford SR33, Sram Force, Bontrager Aeolus 6.5

Random side note:

Research has show that the 220-age thing is often 10-15 beats off.
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